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109 lines
2.2 KiB
C++
109 lines
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_file_filehelper_h__
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#define mozilla_dom_file_filehelper_h__
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#include "FileCommon.h"
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#include "nsIRequestObserver.h"
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#include "nsThreadUtils.h"
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class nsIFileStorage;
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BEGIN_FILE_NAMESPACE
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class FileHelper;
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class FileRequest;
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class FileOutputStreamWrapper;
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class LockedFile;
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class FileHelperListener
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{
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public:
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NS_IMETHOD_(nsrefcnt)
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AddRef() = 0;
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NS_IMETHOD_(nsrefcnt)
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Release() = 0;
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virtual void
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OnFileHelperComplete(FileHelper* aFileHelper) = 0;
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};
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/**
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* Must be subclassed. The subclass must implement DoAsyncRun. It may then
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* choose to implement GetSuccessResult to properly set the result of the
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* success event. Call Enqueue to start the file operation.
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*/
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class FileHelper : public nsIRequestObserver
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{
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friend class FileRequest;
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friend class FileOutputStreamWrapper;
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public:
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSIREQUESTOBSERVER
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nsresult
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Enqueue();
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nsresult
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AsyncRun(FileHelperListener* aListener);
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void
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OnStreamProgress(uint64_t aProgress, uint64_t aProgressMax);
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void
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OnStreamClose()
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{
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NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
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Finish();
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}
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void
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OnStreamDestroy()
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{
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NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
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Finish();
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}
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static LockedFile*
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GetCurrentLockedFile();
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protected:
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FileHelper(LockedFile* aLockedFile, FileRequest* aRequest);
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virtual ~FileHelper();
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virtual nsresult
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DoAsyncRun(nsISupports* aStream) = 0;
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virtual nsresult
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GetSuccessResult(JSContext* aCx, JS::Value* aVal);
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virtual void
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ReleaseObjects();
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void
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Finish();
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nsCOMPtr<nsIFileStorage> mFileStorage;
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nsRefPtr<LockedFile> mLockedFile;
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nsRefPtr<FileRequest> mFileRequest;
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nsRefPtr<FileHelperListener> mListener;
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nsCOMPtr<nsIRequest> mRequest;
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private:
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nsresult mResultCode;
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bool mFinished;
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};
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END_FILE_NAMESPACE
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#endif // mozilla_dom_file_filehelper_h__
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